Watch-crystal gage



' (No Model.) Y

vO. C. KRAEHMER.

WATUH CRYSTAL GAGE. No. 412,631. Patentedjoot. 8, 1889.l

WJZWESSES www1/207e VUNIfIfED jSTATns ATENT OFFICE.

' oScAR o. KRAEHMER, oF GALENA, ILLINOIS.

WATCH-CRYSTAL GAG E.

SPECIFICATION forming part of Letters Patent No. 412,631, dated October 8, 1889.'

Application filed September 17, 1888.` Serial No. 285,633. (No model.)

To a/ZZlwh/om it may concern..i

Be it known that I, OSCAR C. KRAEHMER, a citizen of ,the United States, residing at Galena, inthe county of Jo Daviess and State of Illinois, have invented certain new and useful Improvements in Measuring- Instruments; and I do hereby declare the 'following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.Y g

The invention has relation to measuringinstruments 5 and it consists in the construction and novel combination of parts, as hereinafter' set forth, illustrated in the accompanying drawing, and pointed Yout in the appended claims.

The object of my invention is to provide a simple device bymeans of which the size of a watch-bezel maybe quickly ascertained, so that a crystal lmay be fitted thereto by its number; and a further object is to provide an attachment for obtaining the required height of a crystal.

In the drawing, the figure is a front view of the instrument.

Referring by letter to the drawing, A designates arectangular plate of metal or any other suitable material, and, if preferred, the.

metal may be extended to form a handle B.

Watch-crystals are designated by sizes from 9 to 22, inclusive. Each number is divided into sixteenths, and each sixteenth is divided into eighths, which indicates the height centrally Fis the sliding plate having the heightgage G thereon, which has an indicator-point d, and is adapted to move in guide e on the plate, a coiled spring f being provided on the gage G, between the indicator-point and the low erguide, for the purpose of returning it to its normal position when released. Then the points a b are in the iiange or cut of the bezel, the plate F is moved to bring the gage Gr directly over the center post of the watchmovement. Then by placing the linger on the knob g and pushing the opposite end of the gage G downv upon the center post the point d will indicate on the scale h on the plate the height of glass wanted.

Both sliding plates are provided at their ends with suitable devices for engaging over the edges of the plate A.

It is evident that the size of a glass may be ascertained by placing the glass edge up between the gages; also the height by pushing the opposite end of the gages to the center of inside of glass.

Having described my invention, what I claim, and desire to secure by Letters Patent,

l. The combination of the plate A, the fixed point c, the movable point b, the sliding plate F, and the spring-controlled gage thereon, Substantially as specified.

2. The combination of the plate having the diagonal and longitudinal marksthereon, the iixed point a, the sliding plate having the point b, the sliding plate F, the bar G, moving in guides on said plate, the indicatorpoint, and the spring, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

OSCAR C; KRAE HMER.

VitneSses:

FRANK Bosrwlck, DAVID S. FARLEY. 

